Samuel Stewart "Sam" Witwer (born October 20, 1977) is an American actor and musician. He has appeared in individual episodes of numerous television shows as well as minor recurring characters in shows such as Battlestar Galactica, Smallville, CSI: Crime Scene Investigation, and Dexter. He also voiced the main protagonist, Galen Marek/Starkiller, in the Star Wars: The Force Unleashed video game.